176 Mr. William Wood's Obfervatlons^ ^c, 



valve and three in the other (as is fometimes the 

 cafe), it mud be confidered as incomplete. 



It was not till I began attentively to examine the hinges 

 of Britifli bivalves, that this (hell appeared to me effen- 

 tially different from the V. decujfata. We find it, not 

 uncommonly, on the Sandwich fliore, from half an 

 inch to one and a half or two inches in breadth, and 

 fometimes marked on the outfide (in a zigzag man- 

 ner) with all the flrength and elegance of a foreign 

 fpecimen. 



This fpecies is broader, in proportion, than the V. de-^ 

 cujfata^ and the ftriae are more delicate. 



Fig, 15, 16. Vems cvajfa, (a) The two principal teeth, (b.b.b.b) Re- 

 mote teeth. "^ 

 17, 1 8, The hinge of the Venus undaia, (a) The central tooth, 

 (b) Its cavity. 



Tab. XVIII. 



I, 2. The hinge of the Area Glycymeris^ which in this parti- 

 cular fpecimen is furnilhed with an extraordinary 

 number of teeth. 

 3, 4. Area Nucleus of the natural fize. 

 5, 6. The hinge of the fame magnified. 

 7, 8. The hinge of the PeSlen pidius. 

 9, 10, The hinge of the OJlrea edulis, 

 II, 12. The hinge of the Anomm Ephtppium, 

 13, 14. The hinge of the MytUm edulis, (a. a) The fituation of 

 the teeth. 



XV. Caia^ 



